These series of boards since the P8Z77i Deluxe have been fantastic.
I gave the Z87 impact a swing.
I'm not audiophile by any means, but if there is choice between the two, I prefer better audio (output, in-game, etc) than video quality, especially on games with very immersive story lines.
My quibble:
The separate sound card board quality is fantastic, but is somewhat lessened by not having analog outputs for anything beyond 5.1 surround. I know it's a much lower market for users looking for things over 5.1, but personally I hated having to have analog cable extensions for the reach-around to the side panel outputs to hit 7.1 channels. When such a premium piece of tech is let loose into the wild, the details become a lot more important. It seems like there is some room for a 'bump-out' to the left of the sound card outputs that could fit the extra sockets easily.
*Minutia rant complete*